<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{margin:0;padding:0}
        html,body{
            height: 100%;
        }
        body{
            position: absolute;
        }
        img{
            width: 300px;
            height: 60px;
            position: absolute;
            left: 50%;
            top: 50%;
            margin-left: -150px;
            margin-top: -150px;

        }
    </style>
</head>
<body>
    <img src="images/phone.png" alt="">
</body>
</html>